For Calendar Server installations that separate functionality across front-end
and back-end machines, the hardware platforms and operating systems must be the same
on each end.

More specifically, due to big-endian versus small-endian
incompatibility, you can’t use both an x86 platform machine and a SPARC platform
machine in the same Calendar Server deployment containing front-end and back-end machines.

Moreover, mixing Solaris x86 and Linux operating systems for front-end
and back-end machines has not been tested and is not currently supported.

Hardware Requirements and Recommendations

Approximately 500 MB of disk space for typical installation. For production
systems, at least 1 GB.

128 MB of RAM. For production systems, 256 MB to 1 GB for best performance.

How to Find Patches on SunSolve

As operating
system patch requirements change and patches to Java Enterprise System components
become available, updates will be made available on SunSolve, initially in the form
of recommended patch clusters.